Product Technical Information
Product Description
Norbro 40R Spring Return Pneumatic Actuator Square Drive
| PRODUCT CODE | ISO MOUNT |
SQUARE SIZE |
Face to Face mm |
| B40R10 | F04 | 11mm | 155.3 |
| B40R15 | F05 | 14mm | 195.3 |
| B40R20 | F07 | 17mm | 235.4 |
| B40R25 | F07 | 17mm | 271.0 |
| B40R30 | F10 | 22mm | 325.1 |
The torque output of a spring return actuator declines throughout its rotation and therefore for both the spring and air stroke we specify a 'start' and 'end' torque. For air pressures below 5 bar (g) the number of springs used in the actuator may need to be reduced to 'balance' the torque output of the spring stroke and air stroke.
When sizing spring return actuators it is important that the actuator has sufficient torque to open and close the valve. The table below shows the actuator torque related to the position of the valve for both fail closed (standard) and fail open operation.
Product Technical Information
Product Description
Norbro 40R Spring Return Pneumatic Actuator Square Drive
| PRODUCT CODE | ISO MOUNT |
SQUARE SIZE |
Face to Face mm |
| B40R10 | F04 | 11mm | 155.3 |
| B40R15 | F05 | 14mm | 195.3 |
| B40R20 | F07 | 17mm | 235.4 |
| B40R25 | F07 | 17mm | 271.0 |
| B40R30 | F10 | 22mm | 325.1 |
The torque output of a spring return actuator declines throughout its rotation and therefore for both the spring and air stroke we specify a 'start' and 'end' torque. For air pressures below 5 bar (g) the number of springs used in the actuator may need to be reduced to 'balance' the torque output of the spring stroke and air stroke.
When sizing spring return actuators it is important that the actuator has sufficient torque to open and close the valve. The table below shows the actuator torque related to the position of the valve for both fail closed (standard) and fail open operation.